Solar panels last 30 years or more. The industry standard panel warranty is this:

10 year workmanship warranty

25 year power warranty

Some modules, such as Trina, have a linear power warranty. Most however, have a two-tier step warranty that guarantees this:

90% power at year 10

80% power at year 25

Solar panels degrade gradually over time with exposure to sunlight, wind and weather. Panels are typically warranted 25 – 30 years and have a design lifespan of over 30 years. Energy production is expected to degrade by about one-half of one percent per year.

Inverters are warranted for 10 – 15 years and have an expected lifespan of 15 – 20 years. Future inverters will likely have longer lives. You may need to replace an inverter once in the system’s lifetime and we figure that cost into our financial predictions.